Trapezoidal Screw Jacks offer a low-cost solution to a wide variety of industrial lifting, lowering, pushing and pulling applications. Available in 11 sizes, these worm gear screw jacks feature a self-locking ACME screw and can be ordered with a number of options and configurations, the most basic including Translating, Keyed or Rotating designs. Load capacity from 0.5 tons to 100 tons. Single or multiple jack systems.